Warp stop motion for looms



Novyz, 1937;

J. J. KEARBY 2,097,951

WARP STOP MOTION FOR LOOMS Filed Oct. 20, 1936 2 Sheets-Sheet 1 I NVENTOR,

. BY 71/ 2 I/Iea r65 ATTORNEY.

Nov. 2, 1937. J. J, KEARBY 2,097,951

WARP STOP MOTION FOR LOOMS Filed Oct. 20, 1936 INVENTOR, I I010? IKBfiJby,

ATTORNEY.

2 Sheets-Sheet 2 Patented Nov. 2, 1937 l ATET Fries WARP s'ror MOTION FOR LOOMS John J. Kearby, Paterson, N. J.

Application October 20, 1936, Serial No. 106,598

3 Claims. (01. 139-355) Thisinvention relates to electrical warp stop held in the side bars by springs 4 and on which motion mechanisms for looms and particularly are adapted to be strung the heddles 5 so as to mechanisms of this class in which the stopping be capable of some vertical movement. The slot action is brought into effect when a heddle in the 5a of each heddle which receives the lower 5 heddle-supporting frames of the loom is allowed heddle-bar is appreciably elongated upwardly for to fall by the breakage or undue slackening of a purpose to appear. the corresponding thread. One object is to pro- Driven into the lower rail is a plurality of vide an equipment of this class which is simple upstanding threadedand slotted posts 6 having in construction and may be readily applied to nuts l thereon. These may be regarded as parts 10 any loom. To this end, each such frameis of the frame and they constitute means which, 10 equipped with electro-conductive terminals insuas will appear, serve to clamp in position a bar lated from each other and adapted to be-bridged generally designated 8 and which in the present by a fallen heddle and with a contact electrically example penetrates the slots 6a of the posts, connected with one terminal, and on the supbeing above the lower heddle-bar which also "porting structure there is an abutment forming penetrates said slots. This bar comprises two 15 another contact electrically connected with the metal strips 8a. and 8b, strip 8a being folded lonother terminal and adapted to be engaged by the gitudinally of itself and forming a support for contacts on the frames when the latter descend, strip 81) with insulation 80 between them and the the circuit formed when any frame descends and upper edge of strip 81): projecting above strip 8a.

2 its heddle bridges the terminals including an Strip 3b, whose top edge aifords a seat on which electro-magnet which causes to go into action the a heddle (at the upper end of its slot 5%) may means for effecting the stopping of the loom. rest when it falls, forms one terminal of an elec- In the preferred form the abutment is elastic tric circuit and, according as the post is made to and traverses the frames for a purpose to appear. contact strip 811, or the lower heddle bar, so one The invention also contemplates a novel combior the other of these latter forms the other ter- 25 nation of parts useful in an electric stop motion minal; in the present instance, since only the system of the class in which the stopping is efheddle bar so contacts with the post it forms fected when a heddle frame descends with a such other terminal. The terminal 8b is insue heddle in fallen position therein, the same comlated from the top nut l by a suitable washer 1a.

prising, with a vertically reciprocatory carrying So long as the heddles are supported by the cor- 30 structure including a substantially horizontal responding warp threads they may only contact electro-conductive member (as a heddle bar), a (at the sides of their slots 5a with bar 3 as a substantially horizontal electro-conductive strip terminal; otherwise the heddles may (at the having a longitudinal heddle seat, which memupper ends of said slots) also contact the terher and strip" penetrate the heddles and are minal 8b, thusclosing said break and hence the 35 adapted to be bridged by a fallen heddle, and circuit at this point. The frame as defined above said structure insulating the member and strip and parts 1, la and 8a and the lower heddle bar from each other and also including clamping form what I term a heddle carrying structure means for the strip exerting compression vertiincluding a substantially horizontal electro-concally thereon. V ductive member (said heddle bar) and in which 40 In the drawings, an electro-conductive strip (as 81)) insulated Fig. 1 shows my mechanism as seen in a transfrom said member, is clamped by means (as the verse section of the loom; nuts) exerting compression vertically thereon.

Fig. 2 is a fragmentary view on a larger scale Terminal 8b protrudes from terminal 811 at one showing a heddle frame and its equipment acend and to it is there connected a conductor 9 45 cording to this invention the same as such appear which may penetrate the lower rail I and have in a strip-like conductive contact If! extending Figs. 3 and 4 are sections on lines 33 and lengthwise of such rail. il, respectively, Fig. 2; and Supporting structure is formed by the loom Fig. 5 is a plan of a certain abutment and its frame I! including a cross-bar l2 to which are 5 bracket. connected the usual springs l3 in turn connected Each frame for supporting the heddles, or to hooks l4 on the lower rails. of the heddleheddle-frame, is of the usual type comprising frames and acting normally to pull the latter upper and lower horizontal wood rails l, metal down but yielding when the heddle-frames are 5 side bars 2 and metal heddle-bars 3 which are raised by any suitable harness motion (not shown) acting through cords I5. The left-hand side-bar 2 of each heddle frame is as shown connected to the near hook I4 by a wire l6.

To the loom frame I I so as to be vertically adjustable is affixed a forked bracket I? having its arms projecting inwardly and equipped with hooks l8 having nuts i5 thereon and which, as

at 20, are insulated from the frame. Connecting these hooks so as to be below and so be engaged by the contact strips Hi of the several heddle-frames is a helical spring 2!. A conductor 22 leads from one such hook to ground on the frame and it may contain a source of energy 23 and an electro-magnet 24. How the latter, when energized, causes stopping of the loom is not material; for instance, its armature, not shown, may act for that purpose substantially the same as in the patent to'Pick, No. 683,491.

Operation.Since stopping should not be effected when any heddle-frame is up and so the heddles bridge strip 81) and lower heddle bar due to the downward pressure of the warp the circuit is never adapted completely to be closed except when some heddle-frame is down, its terminal or contact strip iii. engaging spring 2!, and then only if a warp thread corresponding to such heddle-frame has broken or is too slack so that the corresponding heddle is allowed to fall and contact both strip 81) and the lower heddle bar. In other words, each time a heddle-frame structure descends sufliciently to engage its contact strip with spring 2! the circuit is closed at that point but remains open at bar 8 unless a thread breaks or is too slack and so ceases to hold the corresponding heddle out of bridging relation to said strip'and lower heddle bar.

, When any heddle-frame is down the circuit is closed through conductors 22 and 9 and (if a heddle is also down) through the posts 6 and the lower heddle-bar 3 (with which such posts contact), the left side-bar of the heddle-frame, conductor I6, hook l4 and spring l3 back to ground. Of course the strip 8a may be electroconductively connected with the abutment otherwise than as shown.

All parts by which strip But on the one hand and spring 2| ion the other are grounded on the metal frame of the loom are of course conductive.

According to my invention element 25 forms a common circuit-closing medium for all the heddle-frames. It is yielding and preferably elastic to absorb the shock of the descending heddle-frames and so as to permit their vertical.

adjustment relatively to each other as the weaving needs require and still obtain their circuitclosing cooperation with said element. The threaded posts 6 and their nuts 1 permit adjustments of the circuit-closing bar vertically relatively to the heddle-bar.

Having thus fully described my invention what I claim is:

1. The combination, with a frame including horizontal rails, side bars connecting the rails and upper and lower heddle-bars connecting the side-bars, of another bar substantially parallel with and above the lower heddle-bar and including electro-conductive strips insulated from each other and one of which projects above the other, said frame also including means to support the second-named bar including threaded posts upstanding from the lower rail and nuts screwed on each post above and below such bar.

2. In an electric warp stop motion mechanism, the combination, with a vertically reciprocatory heddle carrying structure for electro-conductive heddles, said structure including an elongated substantially horizontal electro-conductive member and vertical threaded posts, of a substantially horizontal electro-conductive strip having a longitudinal heddle seat on which any fallen heddle may rest, said member and strip being adapted to penetrate heddles in said structure normally held elevated by the warp out of contact with said seat and to be bridged by a fallen heddle, and said structure insulating said member and strip from each other and also including nuts screwed on the posts and between which said strip is held clamped.

3. An electric warp stop motion mechanism including up-and-down-reciprocatory frames for supporting heddles vertically movable in the frames, an electric contact on each frame, an elastic flexible and extensible abutment traversing and arranged below and yieldable to each of the frames and adapted to be engaged by the contact of each frame when the latter descends and itself formingan electric contact, electric- 

